The limited capacity of frequency conversion equipment between East Japan (50Hz) and West Japan (60Hz) creates persistent regional price differentials. With Kashiwazaki-Kariwa nuclear plant offline in 2026, the east-west spread has widened further.
Japan's power system has a unique historical legacy: East Japan (Hokkaido, Tohoku, Tokyo) operates on a 50Hz grid, while West Japan (Chubu, Hokuriku, Kansai, Chugoku, Shikoku, Kyushu) uses a 60Hz system. This divergence traces back to the Meiji era, when German (50Hz) and American (60Hz) equipment were imported separately.
Power exchange between East and West Japan must pass through Frequency Converter (FC) facilities. Japan currently has three FC stations (Sakuma, Shin-Shinano, Higashi-Shimizu) with a combined capacity of just 1,200 MW — a bottleneck that is the fundamental cause of persistent east-west price differentials.
This article references the following official publications and public data:
免責聲明 / Disclaimer： Blog articles are for educational and reference purposes only and do not constitute investment advice.
You May Also Like
Spring 2026 saw unprecedented JEPX spot market behavior: daytime prices collapsing to ¥0.01/kWh while evening peaks surged above ¥30. The duck curve has normalized from an occasional anomaly into a structural market feature.
2026 Middle East geopolitical tensions have pushed LNG spot prices to $20/mmBtu, directly raising Japan's thermal power generation marginal costs. This article quantifies the transmission mechanism and time lag between LNG prices and JEPX electricity prices.
TOCOM electricity futures volume surged fivefold in 2025, reaching 96.4% of spot market size in January 2026. This deep-dive covers product structures on TOCOM and EEX, price trends, participant profiles, and the transformative JJ-Link integration framework.
Live Data Platform
JEPX spot prices, futures curves, area price spreads, demand forecasts — your one-stop power trading analytics platform
Cookie Notice
This site uses cookies to remember your language preference and collect anonymous traffic statistics to improve our content. You can choose to accept or decline non-essential cookies. Learn more